1220121200101 has 16 divisors (see below), whose sum is σ = 1251872471808. Its totient is φ = 1188466156800.

The previous prime is 1220121200093. The next prime is 1220121200171. The reversal of 1220121200101 is 1010021210221.

It is a cyclic number.

It is not a de Polignac number, because 1220121200101 - 2³ = 1220121200093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121200171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88981636 + ... + 88995346.

It is an arithmetic number, because the mean of its divisors is an integer number (78242029488).

Almost surely, 2^{1220121200101} is an apocalyptic number.

It is an amenable number.

1220121200101 is a deficient number, since it is larger than the sum of its proper divisors (31751271707).

1220121200101 is a wasteful number, since it uses less digits than its factorization.

1220121200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17052.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220121200101 its reverse (1010021210221), we get a palindrome (2230142410322).

The spelling of 1220121200101 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred thousand, one hundred one".